Mounting for rock drills



MalCh 27, 1934. J. c. CURTIS MOUNTING FOR ROCK DRILLS Filed June 2, 1952 Patented Mar. 27, 1934 TES Arensy 1,952,046 MOUNTING Fon uooK DRILLS .lohn C. Curtis, Cleveland, Ohio, assignor to The Cleveland Rock Drill Company, Cleveland, Ohio,

a corporation of Ohio This invention relates broadly to rock drill, but is more particularly concerned with mounting for rock drill of the drifter type. n

One of the objects of this invention is to pro- 5- vide a mounting for rock drill affording liberal wearing surfaces, thus increasing the longevity of the assembly as well as reducing the cost of maintenance.

Another object of this invention is to produce l a mounting for rock drill which is sturdy in construction and capable of withstanding the severe strains to which mountings of this type are subjected. Other objects and advantages more or less l ancillary to the foregoing and the manner in which the various objects are attained reside in the specific construction and aggroupment of the elements peculiar to this construction, as will become apparent from a more complete examina- -tion of this specification, in the claims of which there are assembled certain specic combinations indicative of the scope and spirit of the invention.

In the drawing which illustrates a preferred embodiment of the invention.

Fig. 1 is a side View partly in section of the mounting assembly illustrating the invention.

Fig. 2 is a sectional View taken in a plane indicated by line 2-2 in Fig. 1. p

Fig. 3 is a cross sectional view taken in a plane indicated by line 3-3 in Fig. 1.

Fig. 4 is a cross sectional View taken in a plane indicated by line 4 4 in Fig. 1.

Figs. 5 and 6 are views similar to Fig. 4 illustrating modifications of the invention.

Fig. 7 is a cross sectional side view of a portion of the mounting assembly illustrating another modification of the invention.

Referring to the drawing in which like charac- Y ters indicate corresponding parts throughout the several views, 10 represents the cylinder of a rock drill within which there is reciprocably mounted a piston capable of delivering striking blows to a cutting tool in a manner common in tools of this type. Secured within the left end -of the cylinder 10, there is a back head 11 having rotatably disposed therein a swivel air connection 12 through which motive fluid may be admitted to reciprocate the working piston.

The cylinder body is formed with an enlarged lateral flange 13 to which there is afxed a hollowed member 14 secured thereto by a plurality of screws 9. Obviously, the member 14 could be made integral with the cylinder 10, but to simplify the manufacture thereof as well as reducing the cost of maintenance, it is preferably made of two separate pieces secured together by means of screws, bolts, or weld. The member 14 together with the flange 13 formsV a guide l5 of rectangular cross section extending substantially the full length of the cylinder 1f). 60 Circumventing the guide of the cylinder 10, there is a shell 17 preferably manufactured out of a rectangular tubularmember within which the guide 15 is capable of slidable engagement. The bottom wall of this tube constitutes a wearing surface upon which the guide 15 may slide while the side walls thereof constitute guiding surfacesfor limiting its lateral movement 'therein. The middle portion of this tube is cut away to provide a slot 18 through which the portion 0 connecting the llange 13 to the cylinder 10 may slide. For securing the complete assembly to a supporting device such as a tripod, there is disposed on the lower wall of the shell 17, a cone 19, secured thereto in any suitable manner as for instance by means of bolts, rivets, or weld.

' Mounted' within the left end of the shell 17, there is a bushing 20 secured therein by a plurality'of transversallydispos'ed bolts 21. Rotate.- bly mounted Within this bushing there is one end of a feed screw 22. The longitudinal displacement of the feed screw is checked by its integral collar 23, andv handle 24, disposed in abutting relation with the end walls of the bushing 20. The handle 24 is screwed on the feed screw 22 and locked thereon by a clamping bolt 25. The other end of the feed screw 22 is journaled within a stationary bushing 26 secured within the rightl end of the shell 17. This bushing is formed with a head 27 through which a bore 28 is provided to conveniently receive the end of the feed screw. The head has a narrow portion 29 extending to the bottom of the shell upon which it is secured by a plurality of studs 30 and nuts 31. Provided within the bottom wall of the member 14, there is a narrow slot 16 extending the major portion of its length. This slot is of sunicient width to permit the passage of the member 14 past the narrow portion 29 of the bushing 26. With this construction, the bottom wall of the member 14 affords eficient wearing surface upon the lower inner wall of the shell 17. The upper wearing surfaces, i. e. the engaging upper wall of the cylinder flange 13 with the upper inner wall of the shell 17 are of less area than the bottom wearing surface. However, these upper surfaces are only intended to check the upward movement of the drill and therefore afford sufficient wearing area to constitute an effective mounting assembly. l

Adjacent the left end of the member 14, the cylinder 10 is formed with an integral tongue 32 projecting within the shell 17. This tongue is provided with a screw threaded bore 33 within which the screw 22 is capable of rotatable engagement to produce the longitudinal displacement of the cylinder 10 by the medium of its guide l5 within the shell 17.

In the modiiication illustrated in Fig. 5, the lateral flange 34 of the cylinder 1U, is made somewhat narrower than the corresponding fiange 13 illustrated in Fig. 4. The member 35 attached to the flange 34 by a plurality of screws 36 is projecting from the sides thereof to constitute with the upper inner wall of the shell 37, wearing surfaces to check the upward movement of the cylinder 10. The bottom wall of the member 35 is also provided with a slot 38 similar to the slot 16 to allow the travel of that member past the bushing 26. With this modification,'it will be observed that the cylinder flange 34 does not engage with the inner wall of the shell 37, thus providing a mounting assembly with a restricted number of wearing parts.

In Fig. 6 there is shown another modification of the invention in which the inner side of the shell 39 is formed by an arcuated wall 40 terminated by two lateral portions 41. The guide of the cylinder l0 is formed by an arcuated member 42 secured to theA flange 43 of the cylinder by a plurality of screws 44. Within the member 42 there is also provided a narrow slot 45 similar to the slot 16 to allow the travel of that member past the bushing 26 as previously explained. In this instance it will be observed that the bottom wearing surface 40 uponk which the member 42 may slide offers, due to its arcuated wall, a greater wearing area, thus increasing ther longevity of the slidably engaging parts, y

Instead of producing the cylinder l0 with a tongue 32 provided with a screw threaded bore 33 within which the screw 22 is capable of engagement as illustrated in Fig. 1, a nut 46. may be incorporated in any of the construction illustrated ,in Figs. 4, 5, and 6. This nut may be secured to the member 47, which is the equivalent of the member 14, by a plurality of screws 48, as illus-A trated in Fig. 7. The nut 46 is the full equivalent of the tongue 32, thus the screw 22 may be rotated ,therein to produce the longitudinal movement of the member 47 and consequently of the drilling motor. It will be observed however that in this construction, the tongue 32 is eliminatedthus reducing the cost of manufacture and facilitating the replacement of the screw threaded portion in engagement with the feed screw 22.

Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or coniining and it is to be further understood that various rearrangements of parts and modification of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. In a drilling motor, the combination with a supporting frame having a groove longitudinally disposed therein, of a drill body comprising a hollowed guide slidable within said groove, of a feed screw having its ends journaled within bushings secured to said supporting frame, said feed screw extending through said guide and capable of rotatable engagement with said drill body to cause the slidable movement of the latter within said groove and of means within said guide to allow its travel past one of said bushings.

2. In a ldrilling motor, the combination with a supporting frame having a groove longitudinally disposed therein, of a drill body comprising a hollowed guide slidable within said groove, of a feed screw having its ends journaled within bushings secured to said supporting frame, one of said bushings being positioned on the path of said guide slidable within said groove, said feed screw extending through said guide and capable of rotatable engagement with said drill body to cause the slidable movement of the latter within said groove, and of means within said guide to allow its travel past the bushing positioned on its path.

3. In a drilling motor, the combination with a supporting frame formed of a rectangular tubular member, of a drill body comprising a hollow guide detachably secured thereto, said guide being slidably mounted within said member and guided thereby, of a feed screw having its ends journaled within bushings secured to the ends of said tubular member, said feed screw extending through said guide and capable of rotatable engagement with said drill body to cause the slidable movement of the latter within said tubular member, and an opened end slot within the lower wall of said guide for permittingthe travel of the latter past one of said bushings.

JOHN C. CURTIS. 

